Х=1/3х+2/9х+28/5, х=1/2х+1/3х+7
Х=1/3х+2/9х+28/5 х-1/3х-2/9х=28/5 4/9 х = 28/5 х=28/5 : 4/9 х=28/5 * 9/4 х=63/5 х=12 3/5 = 12,6 --- х=1/2х+1/3х+7 х-1/2х-1/3х=7 1/6х=7 х=7 : 1/6 х=7*6/1 х=42